123123323221 has 2 divisors, whose sum is σ = 123123323222. Its totient is φ = 123123323220.

The previous prime is 123123323207. The next prime is 123123323231. The reversal of 123123323221 is 122323321321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72232475121 + 50890848100 = 268761^2 + 225590^2 .

It is a cyclic number.

It is not a de Polignac number, because 123123323221 - 2⁵ = 123123323189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123123323231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61561661610 + 61561661611.

It is an arithmetic number, because the mean of its divisors is an integer number (61561661611).

Almost surely, 2^123123323221 is an apocalyptic number.

It is an amenable number.

123123323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123123323221 is an equidigital number, since it uses as much as digits as its factorization.

123123323221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 25.

Adding to 123123323221 its reverse (122323321321), we get a palindrome (245446644542).

The spelling of 123123323221 in words is "one hundred twenty-three billion, one hundred twenty-three million, three hundred twenty-three thousand, two hundred twenty-one".